US 11,686,023 B2
Method for making an elasticised yarn and fabric manufactured from said yarn
Alberto Primo Candiani, Milan (IT)
Assigned to CANDIANI S.P.A., Robecchetto County Induno (IT)
Appl. No. 17/288,436
Filed by CANDIANI S.P.A., Robecchetto County Induno (IT)
PCT Filed Sep. 12, 2019, PCT No. PCT/IB2019/057703
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/084359, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 102018000009805 (IT), filed on Oct. 25, 2018.
Prior Publication US 2021/0395930 A1, Dec. 23, 2021
Int. Cl. D01D 5/00 (2006.01); D03D 15/56 (2021.01)
CPC D03D 15/56 (2021.01) [D10B 2201/01 (2013.01); D10B 2401/061 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for making an elasticised yarn, comprising:
prearranging a source of a roving of a 100% natural fibre, wherein said roving has a linear mass density set between 0.1 Nm and 50 Nm;
prearranging a source of an elastic fibre;
feeding said roving to a stretching unit at a first speed v1;
extracting said roving as stretched roving from said stretching unit at a second speed v3>v1;
unwinding said elastic fibre;
conveying said elastic fibre to an overlapping unit at a third speed v2;
jointly pulling said elastic fibre and said stretched roving, downstream of said overlapping unit, by a ring spinning unit, by making a spool of said elasticised yarn,
wherein said elastic fibre includes:
natural rubber having a polyisoprene 1,4-cis content larger than 80%;
sulphur as a vulcanisation agent at a weight concentration in said natural rubber set between 0.5% and 3.0%;
a vulcanization accelerator and a vulcanization activator;
an anti-tacking agent;
an antioxidant agent; and
a stabilisation agent; and
wherein said elastic fibre is obtained from a longitudinally cut flat yarn of said natural rubber so as to obtain said elastic fibre in the form of an elastic thread having a linear mass density set between 50 dtex and 1000 dtex.